February 2009
SP6682
High Efficiency White LED Charge Pump
Regulator
Rev.
2.
0.
0
GENERAL DESCRIPTION
The SP6682 is a current regulated charge pump ideal for converting a Li-Ion battery input for driving white LEDs used in backlighting color displays or cell phone camera flash applications.
The charge pump automatically switches between x1.
5 and x2 modes based on the program-mable VMODE voltage, providing improved efficiency over traditional methods using charge pump doubler followed by LDO.
This input voltage threshold can be externally programmed by a resistor divider network for optimized efficiency at specific output voltages and currents.
The SP6682 operates with an internal 600kHz cloc...